github-actions: pump node version to v20

Author: HaidarZ

.github/workflows/npmpublish.yml

@@ -12,7 +12,7 @@ jobs:
       - uses: actions/checkout@v3
       - uses: actions/setup-node@v3
         with:
-          node-version: 16
+          node-version: 20
           registry-url: https://registry.npmjs.org/
       # Skip post-install scripts here, as a malicious
       # script could steal NODE_AUTH_TOKEN.